Everyhing ignored by git should also be ignored by the whitespace
linter, so this prevents having to duplicate this list of files.
If we need the whitespace linter to ignore files outside of
.gitignore in the future that should be easy to add.
Change-Id: I096e5cee7f1874f9db85c2f76ad2f0c709decf50
This patch set combines whitespace linter and pep8 together
(as both do code linting) into the same job by dropping the
.zuul.yaml whitespace-linter job and rolling it up into the
same pep8 tox.ini check, just like Deckhand [0].
[0] 0462b7b929/tox.ini (L106)
Change-Id: I31ed60adfd431157ffc96a0f4d5d77d54af37352